You pull the trigger while the bolt is open and then close the bolt while the trigger is depressed. The rifle like most of its contemporaries is not designed with any other decocking mechanism.
The Arisaka was specifically designed so you are unable to do that. The logic as I understand it was to 100% verify that the rifle is cleared as with its contemporaries there is the small possibility you could end up in the state where there is a round in the chamber and the firing pin resting on the round without the round being fired.
To the OP only way to do it is to close the bolt and dry fire it (which if it makes you feel better the rifle was designed to do that).
The Arisaka was specifically designed so you are unable to do that. The logic as I understand it was to 100% verify that the rifle is cleared as with its contemporaries there is the small possibility you could end up in the state where there is a round in the chamber and the firing pin resting on the round without the round being fired.
To the OP only way to do it is to close the bolt and dry fire it (which if it makes you feel better the rifle was designed to do that).



























